Yes, there might be in some fanfictions. Fanfiction writers often explore different relationships and scenarios that didn't occur in the original Naruto series. However, not all fanfictions will have Naruto and Sakura kissing. It depends on the plot and the direction the writer wants to take.
Well, if Naruto and Sakura kiss in fanfiction, the reactions would be diverse. Fans who have been rooting for them, known as shippers, would likely be overjoyed. They would see it as a validation of their long - hoped - for relationship. However, fans of other pairings, like Naruto and Hinata or Sakura and Sasuke, might not take it so well. They might feel that it goes against the 'canon' in a way. Also, some more purist fans might think that it's too out of character for the original Naruto and Sakura. There are so many different perspectives within the Naruto fan community.
The popularity might come from the fact that in the original Naruto series, the relationship between Naruto and Sakura was left somewhat open - ended. Fans love to fill in the gaps and create their own scenarios where they get closer, like sharing a kiss.
One common theme is the realization of hidden feelings. Often, the kiss is a catalyst that makes both Naruto and Sakura understand their true emotions for each other. For example, they might have been denying their feelings for a long time, and the kiss forces them to confront it.
Yes, there are quite a few. Some fanfic writers have explored the relationship between Naruto and Sakura in creative ways that might include a kiss scene. You can find them on various fanfic platforms like FanFiction.net or Archive of Our Own. However, the quality can vary a great deal from one to another.
There might be such fanfictions out there. Fanfiction is a vast realm where writers explore different relationships and scenarios. However, this goes against the canon relationship dynamics in the original 'Naruto' series. Kakashi is more of a mentor figure, and Sakura has her own complex relationships with Sasuke and Naruto.
One possible fanfic could be that Sakura has resentment towards Naruto because she feels he doesn't understand her true feelings for Sasuke. But then, during a dangerous mission, Naruto saves her life in a heroic way. This act makes Sakura realize how much Naruto truly cares for her. In a moment of emotional turmoil, she impulsively kisses him, which then leads to a series of events where they have to confront their feelings for each other and also deal with the implications within their team.
One common theme is the overcoming of obstacles. In the Naruto series, there are many challenges, and in fanfictions, Naruto and Sakura might have to overcome things like external threats or their own insecurities before they share a kiss.